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UNITED STATES PATENT OFFICE.

JOHN N. PIRRONG, OF C ORNING, NENVYORK.

FLUID FOR REMOVING BOILER-SCALE.

SPECIFICATION forming part of Letters Patent No. 341,686, dated May 11. 1886.

Application filed March 20, 1886. Serial No.195,999. (N0 specimens.)

To all whom it may concern.-

Be it known that I, JOHN N. PIRRONG, a citizen of the United States, residing at Gorning, in the county of Steuben and State of New York, haveinvented certain new and useful Improvements in Fluids for Removing Boilcr-Scales, of which the following is a specification.

My fluid composition consists of the following ingredients, combined in about the proportions stated, namely: ordinary pure water, one gallon; calf-skin scrap-leather, three pounds; caustic soda, two ounces; sal-soda, five ounces; bicarbonate of soda, two ounces; alum, three ounces; crude sulphate of ammonia, two ounces; crude carbolic acid, two ounces; lime-water, two ounces.

The proportions given of the above-named ingredients are those ordinarily used; but they may be varied and still obtain satisfactory results; and in some cases the bicarbonate soda and lime-water may be dispensed with.

The following is the preferred manner of making the improved fluid. Any desired quantity of the fluid may be made at once. The leather scraps are boiled in the water for two hours. Then the caustic soda is put in, which serves to cut up fine the leather, and the mixture is strained. Add the soda, and then the alum. The impurities which come to the surface are then skimmed off. The sulphate of ammonia, carbolic acid, and limewater are then successively added.

The fluid thus prepared is ready for use, and for removing scale may be employed thus:

one quart of the fluid every twenty-four hours to each fifty-horsepower boiler capacity. Continue this until the scale is removed, which will generally take from two to four weeks, and during this time the boiler should be blown off and cleaned to remove the mud and debris. To prevent incrustation or the formation of scale, a lesser quantitysay one-half to onethird-will be sufficient.

This fluid will not cause foaming, and is not injurious to iron, brass, or packing. It will protect the boiler and flues by forming on their surfaces a thin coating, which prevents sediment from adhering.

I am aware that the ingredients herein named are not new; also, that separately or several of them together in various combinations have been suggested for this use; but I am not aware that all of the said ingredients in the proportions stated have been used together.

What I claim is The herein described fluid composition as an incrustation-preventive and scale-remover for boilers, consisting of water, scrap-leather, caustic soda, Sal-soda, alum, sulphate of ammonia, and carbolic acid, combined as specified.

In testimony whereof I affix my signature in the presence of two witnesses.

JOHN N. PIRRONG.

\Vitnesses:

LEON J os. WAYAvE, F. A. WILLIAMS. 

